\psset{unit=1.5,algebraic}
\begin{pspicture*}(-3.5,-2)(4.5,2.1)
\psaxes[labelFontSize=\scriptstyle,ticksize=-3pt 0,labelsep=2pt]{<->}(0,0)(-3,-2)(3,2)
\footnotesize
\psplot[linecolor=blue]{-3}{3}{sin(x)}
\rput[l](3.1,0.1){$f(x)=\sen x$}
\uncover<2->{
\psplot[linecolor=red]{-3}{3}{x}
\rput[l](2.2,1.9){$p_{f,0}^1(x)=x$}
}
\uncover<3->{
\psplot[linecolor=green]{-3}{3}{x-x^3/6}
\rput[l](3.1,-1.6){$p_{f,0}^3(x)=x-\frac{1}{6}x^3$}
}
\uncover<4->{
\psplot[linecolor=orange]{-3}{3}{x-x^3/6+x^5/120}
\rput[l](2.4,0.9){$p_{f,0}^5(x)=x-\frac{1}{6}x^3+\frac{1}{120}x^5$}
}
\end{pspicture*}